Return bend



R. BURKE Dec. 18, 1934.

RETURN BEND Filed July 11, 1934 s Sheets-Sheet 1 ,Z'hvantof Dec. 18, 1934. BURKE 1,984,353

RETURN BEND;

Filed July 11; 1954 .3 Sheets-Sheet 2 3 Sheets-Sheet 3 I I I 4 1 I I 1 Dec. 18, 1934. R, BURKE RETURN BEND Filed July 11, 19:54

Patented Dec. 18, 1934 UNITED STATES PATENT OFFICE RETURN BEND Ralph Burke, Milwaukee, Wis., assignor to Sivyer Steel Casting Company, Milwaukee, Wis., a corporation of Wisconsin Application July 11, 1934, Serial No. 734,651 19 Claims. (01. 285-20) This invention pertains to return bends for Fig. 2 is a view in side elevation, partly in connecting tubes to form heating coils for hydrosection, of the return bend; carbon stills and like structures, where oil or Fig. 3 is a cross-sectional view taken on line other fiuids are fed therethrough and heated to 3-3 of Fig. 2; high temperature under very high pressure. Fig. 4 is a detailed view showing the manner 5 The invention particularly pertains to the adof assembling the screw holding plate between the justment of the return tube in respect to the fitupstanding ears of the fitting;

ting or housing, and also the securing of the fit- Fig. 5 is a top plan view of the screw holding ting in position without distortion, as well as perplate;

mitting ready assembly and disassembly for per- Fig. 6 is a side elevational view of Fig. 5; 10

mitting cleaning of the tubes. Fig. '7 is a top plan view of Fig. 4;

Another object of the invention is to form the Fig. 8 is a cross-sectional view of the return fitting in sections, which are secured together by bend with the top broken away; a flexible joint. Fig. 9 is a top plan view of the return bend Another object of the invention is to provide with the pipe bend removed from the fitting; 15 a fitting having relatively narrow vertical arms Fig. 10 is a detailed view of the flexible con which permits a clear view of the return tube in nectlon between the sections of the fitting; order to see that it is properly fitted and adjusted, Fig. 11 is a perspective view of the link or strap and which also permits insertion of a wider return bar which is employed in the flexible connection;

tube section. Fig. 12 is a view showing a modified view of 20 Still another object of the invention is to prosaid link or strap bar; and vide an adjustment which reduces the strain on Fig. 13 is a view showing part of the modificathe toggle plate, thereby preventing any binding tion disclosed in Fig. 12. of the adjusting screw with the toggle plate. Referring to the drawings, numeral 1 desig- The invention accordingly consists in the feanates a pipe or tube bend which is adapted to be 25 tures of construction, combination of elements inserted within a fitting or housing 2, preferably and arrangement of parts which will be exemmade in two separate sections A and B, that are plified in the construction hereinafter set forth flexibly connected together at joint C. Each secand the scope of the application, all of which will tion of the fitting is usually provided with anbe indicated in the appended claims. nular recesses 3 which are adapted to receive the 30 The aim of the present invention is to provide end of pipe coils which are expanded therein. a maximum degree of strength, with a minimum The pipe bend l is provided with tapered ends 4 amount of material, to insure proper axial alignthat are adapted to seat snugly with the conical ment, to permit a clear, unobstructed view to the seats 5 on the fitting, these cooperating parts return tube, to prevent distortion of the upstandbeing compressed together by means of adju5t 35 ing ears on the fitting, to prevent distortion of m screws 6 which impinge against the bosses 7 the seat, and to provide a flexible connection provided on the pipe bend or elbow The adjust between the Sections of the fittmging screw 6 is screw threadedly connected with a Heretofore, it has been the practice to provide toggle plate 8 which is provided with a series of the upstanding arms oi the fitting with mtermeprojections or arms 9 that cooperate with 40 diate vertical slots into which the ends of the Standing arms 10 on the fitting It is important toggle plate were adapted to be recelved, but in that in adjusting the pipe bend that it be accu such construction it is necessary to make the rately Seated upon the seats of the fitting in arms of substantial width and strength, and even order to prevent leakage and also to prevent any then accurate vertical adjustment of the togg-le distortion of the fitting or pipe bend seats. Ac- 45 plate is not assured. Moreover, all the strain cordingly the adjusting devic in the present and stresses are localized to a point immediately vention. aims to provide an adjustment which over the slots. Also in the horse shoe type of a s correct Vertical alignment of the p p tment, where there is a rotational movefigs, axial alignment is impaired. bend w the fi ms- The upst ndms arms 10 m For a better understanding of the invention of the fitting are elongated topr videa substanreference may be made to th accompanying tial neck portion having machined faces 11 which drawings, in which provide a trackway or guide for the arms of the Fig. 1 is a top plan view, with parts broke toggle plate which contact therewith. Above the away, of a return bend embodying my invention; neck portions, the upstanding arms terminate in 55 the cross-head portions which project on opposite sides as cars 12.

By having the upstanding ears constructed relatively narrow, less metal is needed, and a clear View to the inside of the housing or fitting is permitted. Also by having the upstanding ears narrow, a maximum distance is provided between opposite sides of the fitting, thereby permitting the use of a return tube which closely approximates or conforms to a circle, which is the ideal construction in a device of this character.

The cars on the toggle plate are substantially short, thereby reducing the strain on the plate because of the shorter moment arm. This feature is important inasmuch as it gives a maximum rigidity to the toggle plate and prevents same from being flexed, which would cause the plate to bind against the screw, thereby impairing the screw threads and causing the screw threaded connections to bind. The reason for this is illustrated in Fig. 1, which shows the point or points of bearing to be removed or offset from the center line X to lines Y. The difference in length of the moment arm on the off-center lines is of substantial difference, as is shown at Z. It is obvious that the off-center moment arm is of substantially less length than the center moment arm, thereby reducing the bending stress in the toggle. If there be any bending in the toggle, the maximum amount of same will be confined along lines Y, which does pass the screw receiving recess.

The lower surfaces of the ears 12 on the upstanding lugs of the fitting are preferably but not necessarily inclined at 13 to correspond with the inclined engaging surfaces 14 of the ears 8 on the toggle plate. The engaging portions of the ears on the toggle plate are reduced in thickness to provide a boss 14 having vertical face walls 15' to contact with the upstanding ears on the fitting. This construction prevents any distortion of the upstanding ears and causes all strains resulting from the adjusting screw to be in a vertical direction. Ordinarily the engaging surfaces of the upstanding lugs in the screw retaining plate would have a tendency to laterally distort the upstanding ears of the fitting affecting the cooperating seats of the pipe bend. The purpose of the inclined cooperating surfaces is to prevent this and. assure at all times the normal vertical position of the upstanding ears on the fitting.

' In this fitting it will be seen that at least four points of vertical contact are provided between the upstanding arms of the fitting and the arms on the toggle plate. This feature is important to obtain the advantages above pointed out.

The fitting as above described is preferably formed in sections, and one feature of the invention is to attach the sections together by a novel and improved flexible connection. This flexible connection is typified by the provision of two studs, 15 and 16, the former of which is preferably integrally formed or otherwise united on ledge 1'? extending from section A of the fitting, and the latter of which is preferably integrally formed or otherwise united on ledge 18 extending from section B. The studs are positioned in offset relation from the center point of the two sections and, therefore, do not impair or weaken the sections at that point. The sections are attached without any cutting away of any substantial portion of the annular reenforcing ribs 19 around the base of the sections.

The engaging portions of the two fittings are provided with complementary recesses 20 and engaging lugs 21 in order to permit the sections to move relatively in a lateral direction. Relative longitudinal movement, however, is prevented as it would interfere with proper seating of the return tube. The top portion between the fittings is provided with recessed shoulders 22 which provide a recess 23 in which a link or strap 24, preferably of metal, is adapted to be inserted, said strap being provided on each end with a recess 25 which is adapted to receive the studs. Thereafter the parts may be secured in position by the nuts 26 and 27 fitted on and covering the ends of the studs. The recess will be formed slightly in excess of the Width of the strap in order to allow a desired degree of relative movement, but with lugs 21 confined within the recesses. When the link is removed, either section of the fitting may be removed without disturbing the other section. The studs, being formed on or attached to the sections, are always in place and are removed and replaced with the sections.

In Figs. 12 and 13 I have shown a modified construction, in which bolts 28 and 29 are used instead of studs 15 and 16, two plates 30 and 31 being also used.

There are many changes which could be made in the above construction, and many apparently different modifications of this invention may be made without departing from the scope thereof. It is intended that the matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limited sense.

This application is a continuation in part of my application Serial No. 638,435, filed October 19, 1932, Return bend.

What I claim is:

1. A return bend for heating coils comprising a fitting having two upstanding arms each with a plurality of shoulders, a conduit section inserted between the arms and a vertically movable toggle plate having forked means on opposite ends for engaging said shoulders on said arms, whereby said plate may be aligned in its vertical movement.

2. A return bend for heating coils comprising a fitting having two upstanding arms, a conduit section inserted between the arms, a toggle plate having engagement with the outer sides of the arms, and means for clamping said toggle plate outwardly against the arms and for pressing inwardly against the conduit section.

3. A return bend for heating coils comprising a fitting having two upstanding arms, a conduit section inserted between the arms, a cross arm on each of the upstanding arms, a toggle plate adapted to engage with the cross arms, and means to prevent lateral distortion of the arms.

4. A return bend for heating coils comprising a fitting having two upstanding arms, a conduit section inserted between the arms, a cross arm on each of the upstanding arms having an irregular surface, and a toggle plate adapted to engage with the irregular surface of the cross arm.

5. A return bend for heating coils comprising a fitting having two upstanding arms, a conduit section inserted between the arms, a cross arm on each of the upstanding arms having an irregular surface, and a toggle plate having an irregular surface adapted to engage with theirregular surface of the cross arm.

6. A return bend for heating coils comprising a fitting having a pair of relatively narrow upstanding arms extending from a base section, a cross arm on each of the arms, a conduit section inserted between the arms, and a toggle plate forked at opposite ends to cooperate with the upstanding arms between the base section and the cross arm.

7.1 A return bend for heating coils comprising a fitting having two relatively narrow upstanding arms extendingfrom a base section, a cross arm on each of the arms. a conduit section inserted between the arms, a toggle plate forked at opposite ends to cooperate with one of the upstanding arms, and means positively connected with the plate for adjusting same.

8. A return bend of the class specified comprising a fitting having two upstanding arms, a toggle plate forked at its opposite ends and having the fork portions in engagement with the upstandingarms, and screw threaded clamping means for acting on the toggle plate to force it outwardly against the arm engagements and for pressing inwardly against the conduit section.

9. A return bend for heating coils comprising two relatively narrow upstanding arms, a conduit section adapted to be inserted between the arms, means on said arms provided with inclined surfaces, a toggle plate forked at opposite ends to cooperate with each of the upstanding arms, and inclined surfaces on the forms tor engaging with the inclined surfaces on said arms. v

10. A return bend of the class specified comprising a pair of upstanding arms, a conduit section between said arms, a toggle plate extending between the arms and forked at its ends, the arms being provided with shoulders on their outer sides to engage the forked portions of the toggle plates, and a screw through the toggle plate and having its inner end in engagement with the conduit section and adapted when turned to force the toggle plate outwardly against the shoulders on said arms and thereby force the conduit section inwardly.

11. A return bend comprising a fitting composed of separate housings sections each of which is provided with a pair of upstanding arms each having a plurality of. shoulders, a conduit section adapted to be inserted between the arms, and toggle plates adapted-to be inserted between the arms, said toggle plates being forked at opposite end to engage said plurality of shoulders.

12. A return bend comprising a fitting composed of sections, a conduit section and a flexible connection for securing the sections together,

said connection comprising an elongated link,

and a pivotal means on each end of the link for attaching same to the sections.

13. A return bend comprising a fitting composed of sections, a conduit section and a flexible connection for securing the sections together, said connection including two spaced bolts and an elongated link engaging said bolts.

14. A return bend comprising a fitting composed of sections, a conduit, a securing member on each of the sections, a recess formed between the sections, and a linkadapted to seat in the recess and engage each of said sec g members,

15. A return bend compr posed of sections, a conduit, 8. securing member on each of the sections, a recess rormed between the sections, and a link adapted to seat in the recess and engage each of the seeming members, said link being of slightly less width than the width of the recess, to permit relative lateral movement only.

16. A return bend comprising a fitting composed of sections, a conduit, a securing member on each of the sections, means for mating the sections together, and a link means engaging the securing members for holding the sections in mated position.

1'7. A return bend comprising a fitting composed of sections, a conduit, a securing member on each of the sections, means for mating the sections together, a recess formed above the mating means, and a link seated within the recess and engaging each of the securing members.

18. A device of the class specified comprising housing sections adapted to fit and co-operate with the tubes to be connected, a conduit section fitting and co-operating with the housing sections,, and means for connecting the housing sections together comprising bolt-like members, one carried by each housing section, and a link extending between and connected to said bolt-like members to provide for lateral movement but prevent longitudinal movement of said housing sections.

ng a fitting com 19. Adevice ot the class specified comprising housing sections adapted to fit and co-operate with the tubes to be connected, a conduit section fitting and co-operating with the housing sections, means for connecting the housing sections together comprising bolt-like members, one carried by each housing section, and links extending between and connected to the opposite ends of said bolt-like members to provide for lateral movement of said sections but prevent longitudinal movement thereof.

RALPH BURKE. 

